Try calling Norman at Sertech Electronics in San Jose. I had my Tandberg TD 20A SE RtR serviced there years ago. Not sure of he still taking in work but he's good.
Never had issues with my 4 TD20 As that I still own an use today. They're fragile compared to other RtRs of the time but when it comes to SQ it bettered 95% of consumer/prosumer decks.
Never had issues with my 4 TD20 As that I still own an use today. They're fragile compared to other RtRs of the time but when it comes to SQ it bettered 95% of consumer/prosumer decks.